Irish Colcannon Soup with Soda Bread

Ingredients

• 1 tablespoon olive oil
• 1 tablespoon unsalted butter
• 1 medium yellow onion, chopped
• 2 cloves garlic, minced
• 1 head green cabbage, cored and chopped
• 4 cups vegetable broth
• 2 large Russet potatoes, peeled and diced into 1/2-inch cubes
• 1/2 cup heavy cream
• 3 green onions, thinly sliced (for garnish)
• 2 cups all-purpose flour
• 1 teaspoon baking soda
• 2 teaspoons kosher salt
• 1 1/2 cups buttermilk
• 1/2 teaspoon black pepper (for soup)